TUBE
, a pipe, conduit, or canal; being a hollow cylinder, either of metal, wood, glass, or other matter, for the conveyance of air, or water, &c.
The term is chiefly applied to those used in physics, astronomy, anatomy, &c. On other ordinary occasions, we more usually say pipe.
In the memoirs of the French Academy of Sciences, Varignon has given a treatise on the proportions for the diameters of tubes, to give any particular quantities of water. The result of his paper gives these two analogies, viz, that the diminutions of the velocity of water, occasioned by its friction against the sides of Tubes, are as the diameters; the Tubes being supposed equally long: and the quantities of water issuing out at the Tubes, are as the square roots of their diameters, deducting out of them the quantity that each is diminished.
Tube, in Astronomy, is sometimes used for telescope; but more properly for that part of it into which the lenses are fitted, and by which they are directed and used. |
